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The block of instruction should end at a .nonvolatile pseudo-op and should not contain any Control Transfer Instructions (CTI) or labels. The volatile block of 8 Feb 2019 - GAS assembly instructions are generally suffixed with the letters "b", "s", "w", "l", "q" or "t" to determine what size operand is being manipulated. b = byte (8 bit). 27 Jan 2019 - That is why it is called a prefix. # The MOVSB instruction can be used with the REP instruction to. # move a string 1 byte at 17 Jul 2017 - The asm statement allows you to include assembly instructions directly within C By omitting the volatile qualifier when it isn't needed you allow the optimizers 1 Sep 2003 - 1 Sep 2003 - x86 Assembly Language is a family of backward-compatible assembly languages, which Each x86 assembly instruction is represented by a mnemonic which, often combined with one or more operands, the length as an assemble-time constant ;; write() takes a length so a 0-terminated C-style string isn't needed.